Danny,
It may only need to be reset, unplug it for a min. plug it back in and try it.
Check your owners manual some will tell you how to reset them.
Also check for a jammed switch, press every switch one by one if one doesn't move that is the problem, you can possibly unjam it with a small screwdriver.
But it could need servicing.
Same thing happened to our TX-DS777.
Took it to a locate electronic comany and they told us it was the
DSP board gone bad. Est 425.00 to 450.00 to fix.
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